Thermo King 098916, Maintenance Manual

Page: 98 / 196

Operating Instructions
97
NOTE: If the inlet / outlet tubes or filter need to be cleared, disconnect from the gas analyzer
BEFORE purging air through the tubes. If tubes remain connected, serious damage to the gas
analyzer could occur.
Code 69
Gas Analyzer Calibration
(Normal)
1. Stale atmosphere / Filter or inlet /
outlet tubes restricted (SEE NOTE
BELOW)
1. Open evaporator access door or
fully open vent door and allow unit
to operate on high speed fan for
20 to 30 minutes to purge any old,
stale air trapped in the analyzer
module
2. CO2 or O2 sensor faulty 2. Replace analyzer
Code 69
Gas Analyzer Calibration
(During PTI)
1. Stale atmosphere / Filter or inlet /
outlet tubes restricted (SEE NOTE
BELOW)
1. Open evaporator access door or
fully open vent door and allow unit
to operate on high speed fan for
20 to 30 minutes to purge any old,
stale air trapped in the analyzer
module before performing PTI
2. CO2 or O2 sensor faulty 2. Replace analyzer
Code 122
O2 Sensor Calibration Error (if
equipped) (PTI Only) 1. Stale atmosphere / Filter or inlet /
outlet tubes restricted (SEE NOTE
BELOW)
2. O2 sensor reading < 17% or >
25%
1. Open evaporator access door or
fully open vent door and allow unit
to operate on high speed fan for
20 to 30 minutes to purge any old,
stale air trapped in the analyzer
module before performing PTI
2. If O2 reading is still out of
calibration range after purge
procedure noted above is
performed, replace analyzer
Alarms Possible Cause Corrective Action(s)
Data Menu Display Indication Corrective Action(s)
CO2% Open or Short If no alarm has been generated, the
system most likely has not
communicated with or is verifying
communications with the analyzer.
Follow action for ‘Stale Atmosphere’
steps noted above. If fault exists, an
alarm will be generated.
O2% Open or Short If no alarm has been generated, the
system most likely has not
communicated with or is verifying
communications with the analyzer.
Follow action for ‘Stale Atmosphere’
steps noted above. If fault exists, an
alarm will be generated.